Go for two, hardly any more work than one and good insurance. Besides with those trees, you will get the best yield ever! As for honey, in a good year you might get a couple of hundred pounds a hive, in a bad year, maybe 40, less than that and theres a problem. Thats when 2 hives will come into play providing honey for the growing list of relos.
Since I went to two, I have something to compare and if one dies, I can rebuild it using the other as I have done already.
Above all, having two is more fun.
You have snow, so I imagine having two is even more sensible. A two frame extractor brand new is a few hundred bucks for a cheap one. They last forever, a good buy as soon as you can afford it and sounds like you can afford this deal.